Good luck getting channel locks on there. There's some kind of metal trim in the way that makes it nigh impossible, on my car anyway. An easy way to check is to take the line that comes out of the tank and disconnect it where it clamps on to the hard line that runs up front. If fuel streams out you don't need to go any further.

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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo